// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/core/expressions.h>

namespace kumo::pollux::functions {
    /// Analyzes array_sort(array, lambda) call to determine whether it can be
    /// re-written into a simpler call that specifies sort-by expression.
    ///
    /// For example, rewrites
    ///     array_sort(a, (x, y) -> if(length(x) < length(y), -1, if(length(x) >
    ///     length(y), 1, 0))
    /// into
    ///     array_sort(a, x -> length(x))
    ///
    /// Returns new expression or nullptr if rewrite is not possible.
    core::TypedExprPtr rewriteArraySortCall(
        const std::string &prefix,
        const core::TypedExprPtr &expr);
} // namespace kumo::pollux::functions
